The understanding of the morphodynamics of harmonic bed forms on the seabed is essential for modeling marine sediment transport and coastal morphologic development. Previous research has mainly focused on the type and distribution of bed forms, but areally extensive data and time series of seabed features are scarce. Multibeam and side-scan sonar data from four expeditions reveal the contrasts between a coastal site with asymmetric and flattened, three-dimensional (3-D) compound sand waves on a shoreface-…
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